diff --git a/src/main/scala/net/yoshinorin/qualtet/domains/authors/models/AuthorResponseModel.scala b/src/main/scala/net/yoshinorin/qualtet/domains/authors/models/AuthorResponseModel.scala
index c5ae7c85..b2b15bb3 100644
--- a/src/main/scala/net/yoshinorin/qualtet/domains/authors/models/AuthorResponseModel.scala
+++ b/src/main/scala/net/yoshinorin/qualtet/domains/authors/models/AuthorResponseModel.scala
@@ -1,14 +1,13 @@
 package net.yoshinorin.qualtet.domains.authors
 
-import java.time.ZonedDateTime
 import com.github.plokhotnyuk.jsoniter_scala.macros.*
 import com.github.plokhotnyuk.jsoniter_scala.core.*
 
 final case class AuthorResponseModel(
-  id: AuthorId = AuthorId.apply(),
+  id: AuthorId,
   name: AuthorName,
   displayName: AuthorDisplayName,
-  createdAt: Long = ZonedDateTime.now.toEpochSecond
+  createdAt: Long
 )
 
 object AuthorResponseModel {